Abstract
The negative impact of soil salinity on agricultural yields is significant. For agricultural plants, sensitivity to salinity is commonly (but not exclusively) due to the abundance of Na+ in the soil as excess Na+ is toxic to plants. We consider reducing Na+ uptake to be the key, as well as the most efficient approach, to control Na+ accumulation in crop plants and hence to improve their salt resistance. Understanding the mechanism of Na+ uptake by the roots of higher plants is crucial for manipulating salt resistance. Hence, the aim of this review is to highlight and discuss recent advances in our understanding of the mechanisms of Na+ uptake by plant roots at both physiological and molecular levels. We conclude that continued efforts to investigate the mechanisms of root Na+ uptake in higher plants are necessary, especially that of low-affinity Na+ uptake, as it is the means by which sodium enters into plants growing in saline soils.
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Abbreviations
- AKT:
-
Arabidopsis K+ transporter
- CCC:
-
cation-Cl− cotransporter
- CNGC:
-
cyclic-nucleotide-gated channel
- HAK:
-
high-affinity K+ transporter
- HKT:
-
high-affinity K+ transporter
- KT:
-
K+ transporter
- KUP:
-
K+ uptake transporter
- LCT:
-
low-affinity cation transporter
- NSCC:
-
non-selective cation channel
- SOS:
-
salt overly sensitive
- VIC:
-
voltage-independent channel
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Acknowledgements
Research in our lab was funded by the National Basic Research Program of China (973 Program, grant No. 2007CB108901), the National Natural Science Foundation of China (grant No. 30671488, 30700562 and 30770347), the National High Tech Project of China (grant No. 2006AA10Z126), the program for New Century Excellent Talents, China (grant No. NCET-05-0882) and the Interdisciplinary Innovation Research Fund for Young Scholars, Lanzhou University (grant No. LZU200516).
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Zhang, JL., Flowers, T.J. & Wang, SM. Mechanisms of sodium uptake by roots of higher plants. Plant Soil 326, 45–60 (2010). https://doi.org/10.1007/s11104-009-0076-0
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DOI: https://doi.org/10.1007/s11104-009-0076-0